SummaryStructural changes and amino-acid metabolism during the induction and development of androgenesis were examined.The differences in amino-acid metabolism of pollen development in vivo i.e. male gametophyte formation and in vitro i.e. sporophyte formation were observed. Of mature pollen, proline formed 60% of the total amino-acid pool and had shown a consistant increment during pollen development. During the embryogenesis the level of threonine serine, glutamic acid and γ ABA increased while proline concentration decrease to a trace. At the plantlet, stage γ ABA and threonine + serine formed 56.5% of the total amino-acid pool. The different effects of amino-acids added in the culture medium were found.The ultrastruclural studies of the cultured anthers have shown the formation of two equal nuclei, their fusion and the formation of a diploid embryo. In certain cases the degeneration of the generative cell and the formation of embryo from the vegetative cell were observed. In the developing embryos, po...